Electronics Letters · 2001 · 36 citations · 4 references
EngineeringElectrical EngineeringAnalog ElectronicsMicroelectronicsSemiconductor DevicesCmos Circuit DesignCurrent-voltage CharacteristicsElectronics TechnologyMetal-oxide-semiconductor Field-effect TransistorsPower AmplifiersTransistor BiasingAnalog Amplifier DesignCmos Analog Circuit DesignCmos Analog Integrated CircuitsCurrent GainCurrent-mode Circuit DesignGain Control
A CMOS current-mode exponential-control variable-gain amplifier is presented. It consists of a first-order current-mode pseudo-exponential circuit and a current-mode multiplier. Based on the Taylor's series expansion, the pseudo-exponential circuit can be realised by MOSFETs in saturation. The proposed circuit has been fabricated in a 0.5 µm N-well CMOS process with a gain control range of 15 dB. The experimental results confirm the feasibility of the proposed variable-gain amplifier.
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